MEEN 345 EXAM 1 QUESTIONS AND VERIFIED
ANSWERS
Which of the followings is not the objectives of LAB1 (fluid viscosity and viscometers)?
a. Measure viscosity of fluid using a rotary viscometer
b. determine temp dependence of fluid viscosity
c. determine pressure dependence of fluid viscosity
d. classify fluids as newtonian or non-newtonian fluid - Answers - Determine the
pressure dependence of fluid viscosity
What does the plot of a Newtonian fluid look like on a shear rate vs. Viscosity plot? -
Answers - straight line
What does the plot of a shear thinning fluid look like on a shear rate vs. Viscosity plot? -
Answers - exponentially decreasing
What does the plot of a shear thickening fluid look like on a shear rate vs. Viscosity
plot? - Answers - exponentially increasing
T or F: When temperature of the oil increases, the distance between the molecules in
the oil increases and the cohesive force decreases. Therefore, the viscosity of oil
increases as the temperature of the oil increases. - Answers - False
Which of the following fluids will be tested in this lab? Select all that apply.
Motor Oil, Water, Ketchup, Coolant - Answers - Motor Oil and Ketchup
As indicated in the video lecture, which of the following should be included in the
Appendix of your report?
Sample Calculation, Conclusions, Experimental Procedure, List of Equipment - Answers
- Sample Calculation
T or F: For Newtonian Fluids, the viscosity of the fluids do NOT vary with the
temperature. Is the statement true or false? - Answers - False
The pump power was calculated by the following equation and uncertainty table is
provided:
Perform a Kline McClintock uncertainty analysis on the pump power calculation. What is
the uncertainty of the pump power measurement in watt? - Answers - 198 to 242 (220).
know Kline McClintock uncertainty equation
Which of the following fluids can be classified as shear thickening fluid?
Cornstarch in water, Ketchup, Motor Oil, Wall Paint - Answers - Cornstarch in Water
, Which of the following fluids can be classified as non-Newtonian?
Water, Blood, Air, Motor Oil - Answers - Blood
You took 3 trials of viscosity measurement of 10W40 motor oil at low temperatures to
produce the data below. Calculate the boundary layer thickness (h) using the averages
of your trials. D=18.75mm - Answers - 1.51mm (know boundary layer thickness formula)
Which of the following is not an objective of Flow Visualization lab?
To visualize the flow patterns of a liquid by the injection of dye
To determine the drag force experienced by various objects placed in a water flow
To characterize and identify pathlines, streamlines, streamlines and various flow
features
To verify the law of mass conservation along the channel - Answers - To determine the
drag force experienced by various objects placed in a water flow
Water flows over a rectangular body in Laminar Flow Table. Four points or regions have
been labeled in the figure below. Match the flow features given in the list to those
points/regions. - Answers - A: Laminar flow region
B: flow separation region
C: stagnation point
D: wake region
Streamlines - Answers - A curve that is everywhere tangent to the velocity vector at a
given instant
Streaklines - Answers - The locus of all particles that have passed through a given point
during a time interval
Pathlines - Answers - The path taken by individual particles of the fluid as they travel
from point to point
Timelines - Answers - A set of adjacent fluid particles that form a line at a given instant
Water flows through the converging retangular channel as showin below. It took 5
seconds for dye particles to travel from A-B. The density of water is approximately 1000
kg/m3. What is the mass flow rate of water per depth of the channel at narrow gap
region? Assume the velocity is uniform over a cross section of the channel and viscous
effects are negligible. - Answers - 3kg/m*s (Know mass flow rate/velocity equation)
As mentioned in the video lecture, the flow in the Laminar Flow Table will be
approximated as _______.
Select all that apply.
Transient Flow, Incompressible Flow, Steady Flow, Rotational Flow - Answers -
Incompressible Flow, Steady Flow
ANSWERS
Which of the followings is not the objectives of LAB1 (fluid viscosity and viscometers)?
a. Measure viscosity of fluid using a rotary viscometer
b. determine temp dependence of fluid viscosity
c. determine pressure dependence of fluid viscosity
d. classify fluids as newtonian or non-newtonian fluid - Answers - Determine the
pressure dependence of fluid viscosity
What does the plot of a Newtonian fluid look like on a shear rate vs. Viscosity plot? -
Answers - straight line
What does the plot of a shear thinning fluid look like on a shear rate vs. Viscosity plot? -
Answers - exponentially decreasing
What does the plot of a shear thickening fluid look like on a shear rate vs. Viscosity
plot? - Answers - exponentially increasing
T or F: When temperature of the oil increases, the distance between the molecules in
the oil increases and the cohesive force decreases. Therefore, the viscosity of oil
increases as the temperature of the oil increases. - Answers - False
Which of the following fluids will be tested in this lab? Select all that apply.
Motor Oil, Water, Ketchup, Coolant - Answers - Motor Oil and Ketchup
As indicated in the video lecture, which of the following should be included in the
Appendix of your report?
Sample Calculation, Conclusions, Experimental Procedure, List of Equipment - Answers
- Sample Calculation
T or F: For Newtonian Fluids, the viscosity of the fluids do NOT vary with the
temperature. Is the statement true or false? - Answers - False
The pump power was calculated by the following equation and uncertainty table is
provided:
Perform a Kline McClintock uncertainty analysis on the pump power calculation. What is
the uncertainty of the pump power measurement in watt? - Answers - 198 to 242 (220).
know Kline McClintock uncertainty equation
Which of the following fluids can be classified as shear thickening fluid?
Cornstarch in water, Ketchup, Motor Oil, Wall Paint - Answers - Cornstarch in Water
, Which of the following fluids can be classified as non-Newtonian?
Water, Blood, Air, Motor Oil - Answers - Blood
You took 3 trials of viscosity measurement of 10W40 motor oil at low temperatures to
produce the data below. Calculate the boundary layer thickness (h) using the averages
of your trials. D=18.75mm - Answers - 1.51mm (know boundary layer thickness formula)
Which of the following is not an objective of Flow Visualization lab?
To visualize the flow patterns of a liquid by the injection of dye
To determine the drag force experienced by various objects placed in a water flow
To characterize and identify pathlines, streamlines, streamlines and various flow
features
To verify the law of mass conservation along the channel - Answers - To determine the
drag force experienced by various objects placed in a water flow
Water flows over a rectangular body in Laminar Flow Table. Four points or regions have
been labeled in the figure below. Match the flow features given in the list to those
points/regions. - Answers - A: Laminar flow region
B: flow separation region
C: stagnation point
D: wake region
Streamlines - Answers - A curve that is everywhere tangent to the velocity vector at a
given instant
Streaklines - Answers - The locus of all particles that have passed through a given point
during a time interval
Pathlines - Answers - The path taken by individual particles of the fluid as they travel
from point to point
Timelines - Answers - A set of adjacent fluid particles that form a line at a given instant
Water flows through the converging retangular channel as showin below. It took 5
seconds for dye particles to travel from A-B. The density of water is approximately 1000
kg/m3. What is the mass flow rate of water per depth of the channel at narrow gap
region? Assume the velocity is uniform over a cross section of the channel and viscous
effects are negligible. - Answers - 3kg/m*s (Know mass flow rate/velocity equation)
As mentioned in the video lecture, the flow in the Laminar Flow Table will be
approximated as _______.
Select all that apply.
Transient Flow, Incompressible Flow, Steady Flow, Rotational Flow - Answers -
Incompressible Flow, Steady Flow
